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Finding the Fourth Proportional to 510.89, 765.72 and 419.76

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Solution

The fourth proportional to 510.89, 765.72 and 419.76 is: 629.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.89 : 765.72 = 419.76 : x
  2. Step 2: Convert to fraction form
    510.89/765.72 = 419.76/x
  3. Step 3: Cross multiply
    510.89x = 765.72 × 419.76
  4. Step 4: Simplify right side
    510.89x = 321,418.63
  5. Step 5: Solve for x
    x = 321,418.63/510.89
  6. Step 6: Final answer
    x = 629.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.